Magnetic blow-out.



H. E. WHITE. MAGNETIC BLOW-OUT.

APPLICATION FILED 1113.4, 1910.

Patented Aug. 16, 1910.

Inventar Harms! EvI/hte Winessesz .with the are.

UNITED sTATEs PATENT orrion.

HAROLD E. WHITE, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A. CORPORATION OF NEW YORK.

MAGNETIC BLOW-OUT,

Specification of Letters Patent.

Application ined February 4, v1910. serial No. 542,044.

To all whom 'it 'may1 concern.'

'Be it known that I, HAROLD-E. WHITE, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Magnetic Blow- Outs, of which the following is a specification.

My invention relates to magnetic blowouts for switches and contactors, and its object is to provide a blow-out of novel construction, in which the strength of the blowout field is greatest at the time when it is needed, that is, while the arc is beingblown out. A

My invention consists in providing a coil normally inactive, but in position to produce a field at the contacts, provided with conducting members, to which the coil terminals are connected, placed near the contacts, so that when' an arc is formed' between the contacts it springsto these members and thereby places theV coil in series Thus, the coil which is normally out of circuit is cut into circuit at the proper time to produce the blow-'out field when it is needed.

My invention will best be understood by reference to the accompanyingl drawings, in Which- Figure 1 shows a side elevation of a contactor provided with a magnetic blow-out arranged in accordance with my invention; Fig. 2 shows a cross-sectional front elevation of the blow-out magnet, and Fig. 3 is a diagram of connections.

In the drawings I have shown my invention ap lied to the blow-out for a contactor of stan ard design, comprising a magnet A, carried on a sultable base B, actuating a pivoted armature C, at the end of which is carried a contact D Which,when the magnet A is energized, engages a stationary contact E.

F F represent a` pair ofy disks ofinsnlating material which form an arc chute' around the contacts.' Y. n

G G represent the magnetic pole pieces of the blow-out lwhich are joined by a bo lt g. Surrounding this bolt between the pole pieces are two coils H and H, the turns of which are preferably interleaved, as shown in Fig. 2. The coil H has its terminals at le.. It, one of which is connected to the stationary contact E, so that this coil is in series with the contacts and normally energized by the current flowing through them.

-The coil H produces a field tendingV to blow an arc formed between the contacts upward and away from the contactor coil A. J ustabove the contacts D and E are placed' two curved, conductive members J, to which the terminals of coil H are connected. The arc formed between the contacts D and E is blown by the coil H against these membersl J which have adjacent edges near the two contacts, respectively, as is best shown in Fig. 3. When the arc is blown against these members the coil H is thereby placed in series with the arc and assists the coil H in producing the blow-out field. The field is thus strengthened at the time it is needed. The two portions of the arc are blown along the members J which curve away from the contacts D and E, so that the arc is rapidly elongated and br'oken.

I do not desire to limit myself to the particular construction and arrangement of parts shown and described, but aim in the appended claims to cover all. modifications which are within the scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. In a ma etic blow-out, in combination with separab e contacts, a coil normally i11- active, and terminal members for said coil adjacent to saidV contacts to which members the arc formed between said contacts, when separated, springs, whereby said coil is placed in series wit-h'said arc and produces a blow-out field acting on said arc.

2. In a magnetic blow-out, in combination with separable contacts, a coil normally inactive but in position to produce a magnetic field at said contacts, and a pair of members, to which the terminals of said coil are connected, located near said contacts, whereby an arc between said contacts springing to said members places said coil in series with the arc.

3. In a magnetic blow-out, in combination with separable contacts, a coil normally inactive but in position to produce a magnetic field at said contacts, and a pair of members, to which the terminals of said coil are connected, having adjacent edges near to the contacts respectively and curving away from said contacts in the direction 1n which an are between said contacts is blown by the magnetic field of said coil when energized,

whereby the arc springing from said members places the coil in series with itself and is blown along said members by the magnetic field produced by the' coil.

4. ln combination with separable contacts, a blow-out magnet therefor having two coils, one normally in circuit and the other normally inactive but provided with terminal members against which an arc between said contacts is blown by the field produced by the first coil, whereby the second coil is placed .in series with the aro and assists the first coil in producing the blow-out eld.

5. ln combination with separable contacts, a blow-out magnet therefor having two coils, one normally in circuit and the other normally inactive but provided with terminal members against which an arc between said contacts is blown by the field produced by the rst`coil, said plates having adjacent edges near said contacts and curving away in the direction in which the arc is blown, whereby an arc springing from said contacts to said members places the second coil in series with itselic and is blown along the plates by the combined fields of both coils.

ln Witness whereof, l have hereunto set my hand this 3rd day of February, 1910. HAROLD E. WHITE Witnesses:

BENJAMIN B. HULL, HELEN @R1-ono 

